Joint for the angular connection of door window profile frames and the like

ABSTRACT

The angular joint of the invention comprises a slide base portion ( 1 ) and a sheet metal mobile portion ( 2 ) superimposed thereupon, the sheet metal portion ( 2 ) including upwardly extending legs ( 2   e ) with indenting edges ( 2   g ), a bolt ( 3 ) being employed in the tightening process of the joint, wherein after the joint has been inserted into the hollow profile members being brought together for connection, the bolt ( 3 ) acts so as to exert an upwardly raising force onto the sheet metal mobile portion ( 2 ), whilst maintaining base portion ( 1 ) at a fixed position, and subsequently leading the sharp indenting edges ( 2   g ) of the sheet metal portion ( 1 ) to producing an indentation effect into the walls of the corresponding chambers ( 13   a   , 13   b ) of the hollow profiles being angularly connected with the joint, as the joint is being tightened, thereby resulting in a robust, self aligned connection of the hollow profile members.

THE FIELD OF THE ART

The invention relates to an angular joint employed in the process ofangular connections of hollow profiles, such as in the orthogonalconnections of profiles being previously cut at 45° and coming tocontact to form parallelepipedal frames for doors or windows.

Joints for door and window profile frames of the prior art of the typeof spring activated button means removably engaging into suitableapertures of the profiles to stabilize the angular connection thereof,require, prior to employment thereof, the opening of apertures atprecisely selected locations of the profiles wherein are removablyengaged the abovementioned spring activated buttons. This process isawkward and time consuming due to the accuracy required in marking anddrilling of the apertures and often leads to an imperfect fit of theprofiles and to a structure of reduced aesthetics and functionality dueto the non-alignment of the profiles.

EP 0 644 312 discloses a set-square connecting structure for right angleconnections of profile frames for frames for doors and windows, whereina pair of apertures is required in the profiles being brought forconnection, for engagement of protruding teeth of the connectingstructure into these apertures and the safe locking of the profilesections with one another. EP 0235 039 and FR 2 429 350 also discloseconnecting devices for the assembly of tubular profiles for theformation of door/window frames, which function through the engagementof protruding buttons into correspondingly sized side apertures in theprofiles being brought together for connection.

Similarly WO 02/075093 and U.S. Pat. No. 6,042,298 also require theaccurate opening of side apertures onto the profiles to be connected,and they further include a plurality of components that make the jointrather complex and of increased manufacturing and assembly cost.

GB-2 072 296 discloses a joint wherein a clamping member is movedthrough a bolt being screwed along the line of matching contact of theprofiles so that opposed hooks of the clamping member are drawn intoengagement with punched depressions in the outside walls of the hollowsections being connected. Application of such a joint in practicerequires employment of the specific type of profile being proposed inthis patent, whilst the requirement of punched depressions at preciselymeasured locations, worse than the ripening of side apertures onto theprofiles to be connected wherein the nature of openings might allowmarginal fitting tolerances, poses a further problem that the dimensionsof the profiles having being cut and punched or perforated industriallycannot be altered on site, as their installation might require, becausethe punches/perforations would move out of place and would thereforerender the joint inapplicable.

U.S. Pat. No. 5,109,645 discloses a symmetrical shaped metal angle piecewith resilient end portions and sharp edged terminations, that slidesfreely on being entered within the hollow profile sections beingconnected, but thereafter locks into engaged, non withdrawable relation,due to the reversed attitude of the resilient end portions and theirassociated sharp edges. Although this joint is mainly directed to servea permanent connection of the profiles, if disconnection of the frame isdesired, one has to attempt, through slots in the profile walls, to pryinwardly the profiles and release them from jamming engagement. Althoughsimple, the joint in U.S. Pat. No. 5,109,645 is unable of obtainingperimetrically precise contact of the profiles being connected, therebyleading to technical and aesthetic drawbacks, whilst its structure doesnot render it capable or withstanding heavy loads in the range of tons,normally required with door/window frames, without creating undesirablegaps along the plane of matching contact of the hollow profile sections.

The object of the present invention is to provide for an angular jointor hollow metallic profile members being brought together for theformation of door or window frames and the like, said angular jointbeing simple in construction, easily assembled or disassembled andproviding a self-aligned, rigid connection of the profile members.

A further object of the invention is the elimination of the need foraccurately marking and subsequently opening of side apertures onto theprofile members being connected, thereby substantially facilitating andspeeding up of the assembly process.

Another object of the invention is to provide for alternativeembodiments of the joint of the invention, adapting it to variousapplications extending beyond the field of orthogonal connections ofhollow profile members being connected to form door and window framesand making the joint of the invention applicable in connections ofprofile members or any kind and at any angle whatsoever.

The angular joint of the invention comprises a slide base portion 1 anda sheet metal mobile portion 2 superimposed thereupon, the sheet metalportion 2 including upwardly extending legs 2 e with indenting edges 2g, a bolt 3 being employed in the tightening process of the joint,wherein after the joint has been inserted into the hollow profilemembers being brought together for connection, the bolt 3 acts so as toexert an upwardly raising force onto the sheet metal mobile portion 2,whilst maintaining base portion 1 at a fixed position, and subsequentlyleading the sharp indenting edges 2 g of the sheet metal portion 1 toproducing an indentation effect into the walls of the correspondingchambers 13 a, 13 b of the hollow profiles being angularly connectedwith the joint, as the joint is being tightened, thereby resulting in arobust, self aligned connection of the hollow profile members.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a perspective view of the individual items employed in onefirst embodiment of the joint of the invention.

FIG. 1 a shows a sectional view of an illustrative type of a profile forthe assembly of door and window frames being angularly connected bymeans of the joint of the invention.

FIGS. 2 a-b present the joint of the invention in a position prior tostarting and following completion of the angular connection of the twoprofiles, the ends of which have been previously cut at an angle of 45°.

FIG. 2 c shows a magnified detail of the movement of the end leg of themobile portion of the joint of the invention.

FIG. 3 shows a sectional view of an alternative embodiment of theinvention wherein the bolt means used for tightening of the joint passesthrough the fixed slide base portion of the joint.

FIGS. 4 a-4 c present in a perspective view various alternativeembodiments of the joint of the invention and mainly of the slide baseportion thereof.

FIGS. 5 and 5 a-c present in perspective various alternative embodimentsof the joint of the invention and mainly of the sharp edges of the endlegs of the mobile portion thereof.

FIGS. 6 a-b present in a perspective view and a sectional viewrespectively another embodiment of the joint of the invention.

FIGS. 7 a-c present in perspective views three alternative, illustrativesolutions for opening an aperture with internal threading at the mobileportion of the joint of the invention.

FIGS. 8 a and 8 b show an alternative embodiment of the invention,wherein the joint is applied with a pair of apertures, one in each oneof the profiles to be connected, the joint correspondingly comprisingindependently driven legs of the mobile portion thereof.

FIGS. 9 a-c present in a perspective view the sequential steps inmounting and tightening of the joint of the invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The joint of the invention is particularly related with the assembly offrames that are being assembled from previously cut lengths of profilese.g. aluminium or plastic profiles, such profiles having a hollowsection to allow introduction and operation of the joint. A broad, butnot exclusive, field of application of the invention is the connectionof profile members in the corners thereof, when they are broughttogether to form generally parallelepipedal frames or casings for doorand window applications. Such profile members are previously cut at 45°at the matching edges thereof to allow for an optimally aesthetic fit ofthe orthogonal connection.

Thus, whilst the joint of the invention has a necessarily orthogonalconfiguration in the particular application, it may equally well havethe configuration of an acute or an oblique angle to serve applicationswherein the hollow profile members are connected at an acute or anoblique angle respectively.

The dimensions of the joint of the invention may naturally vary to makeit compatible with different sizes and sections of profile members.

An illustrative hollow profile member 50 is shown in FIG. 1 a, suchprofile member 50 comprising a pair of parallel walls 50 c, 50 dextending on the one hand at an open end 50 a wherein is fitted the itemthat is being framed by such perimetrically covering length of theprofile member, e.g. a glass or shutter panel for a door or windowassembly, and on the other hand at and end 50 b, opposite to the openend 50 a, end 50 b being fixedly mounted to the casing. A chamber 13 a,bis formed in between 50 a and 50 b, such chamber serving for theintroduction of the joint of the invention. Whilst other details of theprofile members to be connected may vary, the chambers 13 a,b areavailable for the employment of the joint of the invention. The drawingstherefore depict the abstract detail of such rectangular chambers 13 aand 13 b with respective open ends 12 a, 12 b of the hollow profilemembers being brought together for connection.

The joint of the invention shown in FIG. 1 comprises a fixed slide baseportion 1 and an elastically deformable sheet metal portion 2superimposed onto the fixed slide base portion 1 and having aconfiguration that generally corresponds to the surface of the baseportion 1 whereupon it is being seated. Both portions 1 and 2 aresymmetrically arranged on either side of plane x-x′ (FIG. 2 b), acentral bolt 3 with a screwing head end 3 a and a sharp edge 3 b alsopassing through the same plane of symmetry x-x′ being driven by means ofa screw driver 14, wherein this plane of symmetry x-x′ coincides withthe plane of contact of the two hollow profile members being broughttogether for connection.

The fixed slide base portion 1 is an angular item with a pair of planarouter sides 1 e forming an angle corresponding to the angle at which theprofile members are being connected, at this instance an angle of 90°, aslight planar recession 1 g being formed near the junction of theseouter sides 1 e, such planar recession 1 g serving as a means ofovercoming possible obstacles in the course of sliding of these outersides 1 e onto the walls of corresponding chambers 13 a, 13 b, thatmight be due to possible imperfections in the cutting and finishingprocess of the edges of the metal profile members being brought togetherfor connection. The slide base portion 1 forms a flat basement portion 1a overlying the junction of the above outer sides 1 e with a cavity 1 bbeing centrally located thereupon to serve the purpose of receiving thesharp edge 3 b of bolt 3.

On either side of the above flat basement portion 1 a, that isperpendicularly oriented with regard to the plane of symmetry x-x′ theinner sides of the fixed slide base portion 1 extend to a pair of planarsections 1 c which are substantially parallel to the walls of profilechambers 13 a,b whereupon the outer planar sides 1 e are seated andsubsequently extend into convergent portions 1 d terminating atsymmetrically located edges 1 f. The herein above describedconfiguration of the sides of the fixed slide base portion 1substantially improves the characteristics of the process of sliding ofthe sheet metal mobile portion 2 onto the fixed slide base portion 1 aswill be explained hereinafter.

The sheet metal mobile portion 1 has a configuration generally identicalwith the configuration of the slide base portion 1, with an upperbasement 2 a with a centrally located cavity 2 b wherein is being driventhe sharp edge 3 b of the tightening bolt 3, wherein the upper basement2 a lies perpendicularly to the plane of symmetry x-x′ and symmetricallyabove the basement 1 a of the base portion 1. In turn, the upperbasement 2 a symmetrically extends to planar side surfaces 2 c and 2 d,each with a length generally equivalent to the length of underlyingsurfaces 1 c, 1 d of the base portion 1, whereupon they slide.

The sheet metal mobile portion 2 is bent upwardly at the terminals 2 fof side surfaces 2 c-d at an angle (180-θ)° as illustrated in FIG. 2 c,and extends to upwardly extending sides 2 e on either side thereofterminating at sharp edges 2 g, such upwardly extending sides 2 ethereby being oriented in a direction substantially parallel to theplane of symmetry x-x′.

In accordance to a first preferred embodiment of the invention theabovementioned centrally located cavity 2 b in the sheet metal mobileportion 2 is drilled through to form an opening with internal threadingfor the passage of bolt 3. In FIGS. 7 a-c are depicted possiblealternative solutions for implementing such hole with internalthreading. In FIG. 7 a hole 2 b is being formed by expansion of thesheet metal into a cylindrical collar 19 that is subsequently internallythreaded. In FIG. 7 b is depicted an alternative solution of employmentof an additional plate 18 having a planar surface 18 a with dimensionssuch as to fit onto the basement 2 a of the sheet metal portion 2 and acentral hole 18 b that is internally threaded and coincides with hole 2b on the basement 2 a when plate 18 is brought in contact with basement2 a. Finally in FIG. 7 c is depicted an additional internally threadedcylindrical collar 48 with a body portion 48 a and a central hole 48 bcoinciding with hole 2 b of the sheet metal portion 2.

In the case wherein cavity 2 b in the sheet metal portion 2, is drilledthrough and forms a thorough internally threaded hole, such hole beingimplemented in either one of the illustrative embodiments of FIGS. 7a-c, bolt 3 is driven through this hole 2 b and terminates by contact ofthe sharp edge 3 b thereof onto the cavity 1 b being provided axiallyunderneath hole 2 b on the fixed slide base portion 1. Whilst thiscondition corresponds to the joint having been assembled but nottightened as shown in FIG. 2 a, when as shown in FIG. 2 b, by means ofscrew driver 14 the bolt 3 is being screwed, the force being exerted bythe firm contact of the sharp edge 3 b thereof onto the cavity 1 b ofthe slide base portion 1 maintains the latter firmly in contact with thewalls of the profiles being connected, whilst it produces a reactiveforce that pushes upwardly the sheet metal mobile portion 1 until thesharp edges 2 g thereof indent the relatively softer walls of theprofile members being connected, thereby achieving a robust, selfaligned connection thereof, such self alignment being obtained as aresult of the abovementioned indenting of the walls of the profilemembers extending along a substantial length of the sharp edges 2 g ofthe sheet metal mobile portion 1.

FIG. 2 c characteristically depicts a magnified view of a detail in theprocess of tightening of the joint of the invention. Herein is shownthat following indenting of the sharp edges 2 g of the sheet metalportion 1 into the walls of corresponding chambers 13 a, 13 b of theprofiles to be connected, further screwing of bolt 3 results in aperfect convergence of the profiles to be connected along the axis ofsymmetry x-x′, whilst the upwardly extending sides 2 e of the sheetmetal portion 2 move through an infinitesimal distance a′, having alength of the order of a fraction of a mm, thereby being deflected at anangle θ′° relatively to the side surfaces 2 d of the sheet metal mobileportion 2. Resilient stresses are thereby stored in sheet metal portion2, uniformly applied on either side of the joint, such stresses therebymaintaining the joint in a tightened condition and the profile membersrigidly connected even if an accidental slight release of bolt 3 mayoccur.

In accordance to an alternative embodiment of the invention, instead ofopening a hole through the above cavity 2 b in the sheet metal mobileportion 2, a hole is drilled through the corresponding coaxial cavity 1b of the fixed slide base portion 1 as shown in FIG. 3. The bolt 3 isthen being driven from the inner junction of the profiles to beconnected and sharp edge 3 b thereof firmly contracts sheet metalportion 2 at cavity 2 b thereof and exerts a raising force thereupon,eventually resulting in the indentation of the walls of the profiles tobe connected by the sharp edges 2 g of the upwardly extending sides 2 eof the sheet metal mobile portion 2.

The form of the sharp edges 2 g of the upwardly extending sides 2 e ofthe sheet metal mobile portion 2 is selected so as to render an optimumindentation effect. Thus, they may for example have the toothed formdepicted in FIG. 1 or FIG. 4 a and FIG. 4 b or they may take the doublerazor edge like form of edges 20 g in the upwardly extending sides 20 eof an alternative embodiment of the invention depicted in FIGS. 5, 5 a,wherein the mobile portion 2 of the joint of the invention is made froma profile of hard aluminium alloy with an upper basement 20 a providedwith a centrally located hole 20 b and sides 20 c-20 d in slidingcontract with corresponding sides of the underlying slide base portion1. A single razor edge ending of upwardly extending sides 20 e of themobile portion 20 made from hard aluminium alloy may be equallyeffective in the indentation of the relatively softer walls of thehollow profiles to be connected, however the double razor edge likeconfiguration further serves the purpose of a secure sequentialindentation of the walls of the profile members.

Alternatively, as shown in FIG. 5 b, the upwardly extending legs 20 e ofthe mobile portion 20 may form a recession, wherein an independent sheetmetal plate 15, preferably with toothed edge configuration may be fittedto serve as an indentation means.

A further alternative embodiment is shown in FIG. 5 b, wherein legs 20 emay extend to a plurality of pointed pins 20 g′.

Finally in FIGS. 6 a, 6 b the sheet metal portion 2 is alternativelymade with side surfaces 2 c ending at a bent structure of the sheetmetal portion forming a recession 17 for the engagement of a wire 16,made from steel in the form of a Π section in substitution of theotherwise planar sides 2 d of the sheet metal portion 2, with the legsthereof bent to upwardly extending members with sharp edges 16 g playingthe role of profile wall indentation elements. In this embodiment, thefixed base portion 1 may be made in two identical portions,symmetrically on either side of the plane of symmetry x-x′, the twoidentical portions being pivotally connected around a pivotal axis 60and thereby being appropriate for the connection of hollow profilesforming varying angles at the junction thereof. The sheet metal mobileportion 2 might under such circumstances also be adjustable to profileconnections at varying angles with the pivotally mounted end portion 16thereof.

The fixed slide base portion 1 of the joint of the invention may alsoreceive alternative forms. In FIG. 4 a base portion 1 is provided withelevated end walls 6 with opposing central nerves 5 that fit intorecessions 4 of the sheet metal mobile portion 2. Alternatively in FIG.4 c, base portion 1 does not terminate in the abovementioned terminals 1f, but is bent upwardly following a configuration similar to that of thesheet metal portion 2, so that the upwardly extending legs 2 e of thelatter may fit into the recessions being formed by the upwardlyextending legs 1 e′ of the fixed slide base portion 1.

The joint configuration depicted in FIG. 4 a and preferably that of FIG.4 c serves as an advantageous embodiment, wherein the sheet metal mobileportion 2 fits tightly into slide base portion 1, so as to facilitatepackaging of the joint and enable handling of the same as if it were asingle item.

FIG. 4 b shows an alternative embodiment of the base portion 1 of theinvention, which is more bulky and is applicable in cases of rather wideprofile connections, wherein due to the bulk of the base portion 1, itis preferably made with perforations 7, in order to reduce material costand weight of the item.

FIG. 8 a depicts an alternative embodiment of the joint of theinvention, wherein the sheet metal portion 2 is made in two discrete,independent parts, whilst the single item of the base portion 1 furthercomprises flat plate extensions 1 h perpendicularly located on eitherside near the top thereof, wherein these flat plate extensions 1 h havean internally threaded hole, whilst the upper basement portion of sheetmetal mobile portion 2 is substituted by a perpendicularly bent portion2 h also perforated coaxially with the internally threaded hole of theflat plate extension 1 h of the slide base portion 1, so that a bolt 3 cpassing through these coaxial holes with its head blocked by flat plateextension 1 h and with a nut at the other end thereof at the bottom ofthe flat plate extension 2 h of the mobile portion 1 selves as the meansof unilaterally tightening the joint.

Whilst in other embodiments a centrally located hole being opened in twohalves 11 a and 11 b at the upper corner (or lower corner in case of theembodiment of FIG. 3) junction of the profiles to be connected issufficient for tightening the joint of he invention, in the case of theembodiment of FIG. 8 a two distinct holes 11 a, 11 b are necessary inthe corresponding chambers 13 a, 13 b of the profile members beingconnected.

Employment of the joint of the invention advantageously leads to a novelmethod of angular connection of hollow profile members made fromaluminium, plastics or other materials that offers enhanced speed and isuser friendly, this method comprising the following steps:

a. Drilling of a single hole made of two halves 11 a, 11 b, one half ineach of the hollow profile members being brought together for an angularconnection, the edges of such profile members having previously beingappropriately cut at an angle of half the magnitude of the angleintended by their connection, e.g. being cut at an angle of 45° when theangle intended by their connection is 90°.

b. Inserting the previously assembled joint with a central bolt 3passing through the upper sheet metal mobile portion 2 and stopping atthe underlying base portion 1, through the opening 12 a of a chamber 13a of a first one of the pair of hollow profile members to be connected,wherein half of the joint is introduced in this first one of the pair ofprofile members.

c. Bringing the chamber 13 b of the second one of the pair of hollowprofile members to be connected in a position wherein the protrudinghalf of the joint is slidably inserted therein, thereby obtaining anaccurate coincidence of the previously cut edges of the hollow profilemembers to be connected and further obtaining the centrally locatedangular hole 11 a, b by coincidence of the two halves 11 a, 11 b.

d. Employment of a key 14 passing through the angular hole 11 a, b androtation by means of the same of the bolt 3 lying coaxially along theplane of connection of the two hollow profile members that have beenconnected, until the sharp edges of the upwardly extending sides of thesheet metal portion 2 indent the walls of chambers 13 a, 13 b therebyleading to a rigid, aligned and angular connection of the abovementionedhollow profile members.

1. Joint for the angular connection of hollow profile members intendedto form door/window profile frames, wherein the edges of the hollowprofile members have been previously cut at an angle such as to obtain amatching contact following the assembly thereof, the joint comprising aslide base portion (1) with an upper first flat basement (1 a) with acentrally located first cavity (1 b) and with first side partssymmetrically extending on either side of said first flat basement (1a), each one of said first side parts having planar surfaces (1 e) ableto come into sliding contact with a wall of each one of a pair ofchambers (13 a, 13 b) of the hollow profile members being broughttogether for connection, a mobile portion (2) with an upper second flatbasement (2 a) with a centrally located second cavity (2 b) and withsecond side parts symmetrically extending on either side of said secondflat basement (2 a), said first and second side parts beingsymmetrically arranged on either side of a plane of symmetry (x-x′)passing through the plane of matching contact of the previously cutedges of said hollow profile members, said mobile portion (2) comprisingupwardly extending sides (2 e) on either side thereof terminating atsharp edges (2 g), said sharp edges (2 g) being adapted to produce anindentation effect into the walls of chambers (13 a, 13 b) and a bolt(3) being employed in a tightening process of the joint, said upwardlyextending sides (2 e) of said mobile portion (2) being oriented in adirection substantially parallel to the plane of symmetry (x-x′), saidbolt (3) being able to pass through a hole (11 a,b) of the hollowprofile members lying at said plane of symmetry (x-x′), said bolt beingable to be screwed to exert an upwardly pushing force onto said mobileportion (2) until said sharp edges (2 g) thereof indent the walls of theprofile members being connected, characterized in that: each one of saidfirst side parts comprising a first section (1 c) extending into asecond convergent surface (1 d), said first section (1 c) extendingsubstantially parallel to the walls of said hollow profile memberswhereupon said planar surfaces (1 e) are seated and said secondconvergent surface (1 d) extending inwardly in the direction of thewalls of said hollow profile members; said slide base portion (1)comprising a planar recession (1 g) close to the junction of said planarsurfaces (1 e), said planar recession (1 g) being seated onto the cornerof matching contact of said hollow profile members; said mobile portion(2) is a sheet metal portion having a configuration similar to theconfiguration of said slide base portion (1); each one of said secondside parts comprising planar side surfaces (2 c) and (2 d), each with alength generally equivalent to the length of underlying correspondingsaid first section (1 c) and said second convergent surface (1 d) ofsaid slide base portion (1), said mobile portion (2) being superimposedonto said slide base portion (1) so that said second flat basement (2 a)is oriented parallel above said underlying first flat basement (1 a) ina direction perpendicular to said plane of symmetry (x-x′) and so thatsaid planar side surfaces (2 c, 2 d) of said mobile portion (2) extendcorrespondingly along said first section (1 c) and said secondconvergent surface (1 d) of said slide base portion (1) during insertionof said joint within the hollow profile members and that said saidplanar side surfaces (2 c, 2 d) are raised upwardly as said bolt (3) isbeing screwed to produce the identation effect through said sharp edges(2 g) indenting the walls of the profile members.
 2. Joint for theangular connection of hollow profile members as claimed in above claim1, characterized in that said slide base portion (1) further includingbent legs (1 e′), said bent legs (1 e′) forming recessions allowingtight fitting therein of said upwardly extending sides (2 e) of saidsheet metal portion (1), wherein following assembly and introduction ofsaid joint within a junction corner of the hollow profile members beingconnected, screwing of said bolt (3) leads to said sharp edges (2 g) ofsaid mobile portion (2) contacting the walls of said correspondingchambers (13 a, 13 b) of the profiles being connected, self alignmentthrough perfect convergence of the profiles being connected along theaxis of symmetry (x-x′) and indentation of said sharp edges (2 g) ofsaid sheet metal mobile portion (2) into the walls of said correspondingchambers (13 a, 13 b) of the profiles being connected after saidupwardly extending sides (2 e) of said mobile portion (2) have beendeflected relatively to said second side parts thereby leading toresilient stresses uniformly applied on either side of the joint beingstored in said mobile portion (2), said resilient stresses therebymaintaining the joint in a tightened condition and the profile membersrigidly connected.
 3. Joint for the angular connection of hollow profilemembers as claimed in above claim 1, characterized by that said sharpedges (2 g) of said mobile portion (2) producing the indentation effectmay alternatively take the form of an arrangement of tooth or pointedpin protrusions or razor edge like sharp surfaces, said arrangement oftooth or pointed pin protrusions or razor edge like sharp surfacestaking the form of a single acting indentation effective surface orconstituted by a pair of adjacently acting indentation effectivesurfaces.
 4. Joint for the angular connection of hollow profile membersas claimed in above claim 3, characterized by that said sharp edges (2g) of said mobile portion (2) producing the indentation effect areincluded in an independent plate item (15), said plate item (15) beingintroduced into a recession being formed at the terminals of saidupwardly extending sides (2 e) of said mobile portion (2).
 5. Joint forthe angular connection of hollow profile members as claimed in aboveclaim 1, characterized by that said second side parts of said mobileportion (2) end at a bent structure thereby forming a recession (17) forthe engagement of a pivotally mounted wire (16) made from steel, saidpivotally mounted wire (16) having the form of a Π section with the legsthereof bent to upwardly extending members with sharp edges (16 g)producing the profile wall indentation effect and by that said slidebase portion (1) being made in two identical portions, symmetrically oneither side of said plane of symmetry (x-x′), said two identicalportions being pivotally connected around a pivotal axis (60) therebybeing appropriate for the connection of hollow profiles forming varyingangles at the junction thereof and said sheet metal mobile portion (2)being also adjustable to profile connections at varying angles bymovement of said pivotally mounted wire (16).
 6. Joint for the angularconnection of hollow profile members as claimed in above claim 1,characterized by that said bolt (3) passing through a hole (11 a,b)lying at said plane of symmetry (x-x′) and exerting when being screwedan upwardly pushing force onto said sheet metal mobile portion (2) untilsaid sharp edges (2 g) thereof indent the relatively softer walls of theprofile members being connected, passes through an internally threadedhole at said centrally located second cavity (2 b) of said mobileportion (2) and subsequently stops by contact of a sharp edge (3 b)thereof onto the coaxially underlying said first cavity (1 b) of saidbase portion (1).
 7. Joint for the angular connection of hollow profilemembers as claimed in above claim 6, characterized by that saidinternally threaded hole at said centrally located second cavity (2 b)of said mobile portion (2) is being formed by either expansion of thesheet metal at said second cavity (2 b) into a cylindrical collar (19)that is subsequently internally threaded or by the alternative addition,onto said second basement (2 a), of either an independent plate (18)having a planar surface (18 a) with dimensions to fit onto said secondbasement (2 a) of said mobile portion (2) and a central hole (18 b) thatis internally threaded and coincides with a hole being opened at saidcentrally located second cavity (2 b) on said second basement (2 a) orof an internally threaded cylindrical collar (48) with a body portion(48 a) and a central hole (48 b) coinciding with said hole being openedat said centrally located second cavity (2 b) on said second basement (2a) of the sheet metal portion (2).
 8. Joint for the angular connectionof hollow profile members as claimed in above claim 1, characterized bythat said bolt (3) passing through a hole (11 a,b) lying at said planeof symmetry (x-x′) and exerting when being screwed an upwardly pushingforce onto said mobile portion (2) until said sharp edges (2 g) thereofindent the relatively softer walls of the profile members beingconnected, passes through an internally threaded hole at said centrallylocated first cavity (1 b) of said slide base portion (1), a sharp edge(3 b) of said bolt (3) being brought in contact with the coaxiallyoverlying said second cavity (2 b) of said mobile portion (2), whereinsaid upwardly pushing force exerted onto said sheet metal mobile portion(2) is the force being exerted onto said second cavity (2 b) of saidsheet metal mobile portion (2).
 9. Method of angular connection ofhollow profile members intended to form door/window profile frames,wherein the edges of the hollow profile members have been previously cutat an angle such as to obtain a matching contact following the assemblythereof and comprise a single hole (11 a,b) made of two halves (11 a),(11 b), one half in each of the hollow profile members being broughttogether for an angular connection, comprising the following steps: a.inserting a previously assembled joint with a central bolt (3) passingthrough an upper sheet metal mobile portion (2) and stopping at anunderlying base portion (1) thereof, through an opening (12 a) of achamber (13 a) of a first one of the pair of hollow profile members tobe connected, wherein half of the joint is introduced in this first oneof the pair of profile members, b. bringing a chamber (13 b) of thesecond one of the pair of hollow profile members to be connected in aposition wherein the protruding half of the joint is slidably insertedtherein, thereby obtaining an accurate coincidence of the previously cutedges of the hollow profile members to be connected and furtherobtaining said centrally located single angular hole (11 a,b) bycoincidence of the two halves (11 a, 11 b), c. employment of a key (14)passing through said single angular hole (11 a,b) and rotation by meansof the same of said bolt (3) lying coaxially along the plane ofconnection of the two hollow profile members that have been connected,until the sharp edges (2 g) of upwardly extending sides of the sheetmetal portion (2) contact the walls of said chambers (13 a, 13 b), andd. further screwing of said bolt (3) to obtain self alignment throughperfect convergence of the profiles being connected along the axis ofsymmetry x-x′ and indentation of said sharp edges (2 g) of said sheetmetal mobile portion (2) into the walls of said corresponding chambers(13 a, 13 b) of the profiles being connected whilst the upwardlyextending sides (2 e) of the sheet metal mobile portion (2) aredeflected relatively to the side surfaces (2 d) of the sheet metalmobile portion (2) thereby leading to resilient stresses uniformlyapplied on either side of the joint being stored in said sheet metalmobile portion (2), said resilient stresses thereby maintaining thejoint in a tightened condition and the profile members rigidlyconnected.